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Sabet, Arash Shafiee
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Topics
Publications (6/6 displayed)
- 2023Effects of temperature on friction and degradation of dry film lubricants during sliding against aluminum alloy sheetscitations
- 2023Influence of alloy composition and lubrication on the formability of Al-Mg-Si alloy blankscitations
- 2023Influence of natural aging on the formability of Al-Mg-Si alloy blankscitations
- 2022Improving deep drawing simulations based on tribological investigations
- 2021Tribological investigations on aluminum alloys at different contact conditions for simulation of deep drawing processescitations
- 2021Characterization of wear and friction between tool steel and aluminum alloys in sheet forming at room temperaturecitations
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article
Influence of natural aging on the formability of Al-Mg-Si alloy blanks
Abstract
<p>The formability of naturally-aged Al-Mg-Si alloy blanks (6xxx alloys) is considered as stable within 6 months after the solution heat treatment (SHT). After this period of time the blanks are usually classified as expired, since their formability may decrease, which affects the stability of the forming processes as well as the integrity of the formed components. Extending the period of stable formability is of utmost interest for the sheet metal forming industry; however, detailed knowledge about its time-dependent degradation caused by natural aging (NA) is still lacking. Therefore, the present work investigates the influence of NA on the formability of four 1-mm-thick Al-Mg-Si alloy blanks with different contents of Si and Mg and dry lubricants. The formability-related properties of the blanks were monitored over a total period of 18 months. A cross-shaped open tool and a complex-shaped closed tool representing geometrical features of typical car body panels were used for deep drawing. Moreover, plate-bending tests for characterizing the hemming behavior were performed. After 18 months of NA the yield strength of the Al-Mg-Si alloy blanks increased by about 20–25 %, but no significant decrease of uniform strain, fracture strain and anisotropy (r-value) was observed. The formability decreased neither at the low forming velocity of 10 mm/s, nor at the high forming velocity of 100 mm/s. Hence, the formability can be related to the r-value, since both were constant during NA. Moreover, a relation between the bendability and the strain hardening behavior (n-value) was detected, since both continuously decreased during NA.</p>